Question

A 0.240 g pebble is fired at a speed of 14.6 m/s from the top of a 20.0 m tall building. Ignoring air resistance, find the kinetic energy with which the pebble strikes the ground when the pebble is fired vertically straight up.

A ball which is thrown straight up takes 3.50 s to reach the maximum height. Determine the gravitational potential energy of the ball (m = 0.145 kg) when it reaches the maximum height.

Answer #1

A 0.240 g pebble is fired horizontally at a speed of 18.0 m/s
from the top of a 38.5 m tall building. Ignoring air resistance,
find the momentum when the pebble reaches a height of 25.0 m.

A boy uses a slingshot to launch a pebble straight up into the
air. The pebble reaches a height of 38.0 m above the launch point
1.0 seconds later. Assume air resistance is negligible.
(a) What was the pebble's initial speed (just after leaving the
slingshot)?
42.9 m/s
(b) How much time did it take for the pebble to first reach a
height of 19.0 m above its launch point?
? s
You toss a tennis ball straight upward. At...

A pebble is thrown vertically downwards with a velocity of 5
m/s, and impacts the ground at 10 m/s. If the pebble was thrown
vertically upwards from the same height with the same initial sped,
with what velocity would it impact the ground after falling back
down?

A ball is thrown vertically upwards with an initial velocity of
10 m/s, from a platform that is at a height of 75 m above the
ground. The ball reaches a maximum height and, on the way down,
misses the platform and falls all the way to the ground. Take the
magnitude of the acceleration due to gravity to be 10 m/s2.
(a) What is the velocity of the ball just before it reaches the
ground?
(b) How many seconds...

A man throws a ball straight upward with speed 30 m/s from the
top of a building that is 75 m high. Ignore air resistance and
choose the vertical y-axis to be positive downward with
origin at the point of throw (top of the building).
Represent the initial velocity and the acceleration vectors in
the reference y-axis above.
Find the maximum height the ball reaches with respect to the
ground.
How long does it take the ball to reach the...

A blue ball is thrown upward with an initial speed of 21.2 m/s,
from a height of 0.5 meters above the ground. 2.6 seconds after the
blue ball is thrown, a red ball is thrown down with an initial
speed of 11.7 m/s from a height of 25.7 meters above the ground.
The force of gravity due to the earth results in the balls each
having a constant downward acceleration of 9.81
m/s2.
A) What is the speed of the...

A ball, mass is 8 kg, is thrown from the top of a 30 m cliff
with a velocity of 20 m/s straight up. The ball misses the cliff on
the way down. Ignore air resistance. Use work and conservation of
energy to find the following values.
a. what is the work done by gravity while the ball is in the
air?
b. what is the maximum height of the ball?
c. what is the magnitude of the velocity just...

A marble is thrown horizontally with a speed of 22.1 m/s from
the top of a building. When it strikes the ground, the marble has a
velocity that makes an angle of 46 ° with the horizontal. From what
height above the ground was the marble thrown?

A ball is thrown straight up, with no air resistance. Its speed
at half the maximum height that it can reach is 18.0 m/s.
Calculate the maximum height it reaches, in meters. Use g
= 10 m/s2.

A ball is thrown vertically upward with a speed of 25.0 m/s from
a height of 30 m from the ground.
How high does it rise from the ground?
How long does it take to reach the maximum height from the point
of projection?
How long does it take to reach to the ground?

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